Replicating the Z iron opacity experiments on the NIF
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- National Security Technologies, LLC, Livermore, CA (United States)
- Univ. of Rochester Lab. for Laser Energetics, Rochester, NY (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Here, X-ray opacity is a crucial factor of all radiation-hydrodynamics calculations, yet it is one of the least validated of the material properties in the simulation codes. Recent opacity experiments at the Sandia Z-machine have shown up to factors of two discrepancies between theory and experiment, casting doubt on the validity of the opacity models. Therefore, a new experimental opacity platform is being developed on the National Ignition Facility (NIF) not only to verify the Z-machine experimental results but also to extend the experiments to other temperatures and densities. The first experiments will be directed towards measuring the opacity of iron at a temperature of ~160 eV and an electron density of ~7 x 1021 cm-3. Preliminary experiments on NIF have demonstrated the ability to create a sufficiently bright point backlighter using an imploding plastic capsule and also a hohlraum that can heat the opacity sample to the desired conditions. The first of these iron opacity experiments is expected to be performed in 2017.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344; AC52-06NA25396; AC04-94AL85000; AC52-06NA25946
- OSTI ID:
- 1358308
- Alternate ID(s):
- OSTI ID: 1397496
- Report Number(s):
- LLNL-CONF-731466; PII: S1574181817300459
- Journal Information:
- High Energy Density Physics, Vol. 23, Issue C; Conference: Radiative Properties of Hot Dense Matter 2016, Santa Barbara, CA (United States), 5-9 Dec 2016; ISSN 1574-1818
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Hohlraum modeling for opacity experiments on the National Ignition Facility
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journal | June 2018 |
Implementation of a 1-2 keV point-projection x-ray spectrometer on the National Ignition Facility
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journal | October 2018 |
Iron X-ray Transmission at Temperature Near 150 eV Using the National Ignition Facility: First Measurements and Paths to Uncertainty Reduction
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journal | October 2018 |
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